Which of the following is a characteristic of all cancers?
A. Uncontrolled cell division
B. Metastasis
C. Rapid proliferation
D. Uncontrolled cell division and metastasis only
E. All of these are characterisitic of all cancers
D
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What structure in most ray-finned fish is responsible for buoyancy control?
a. Gas gland b. Blubber c. Squaline d. Swim bladder
What is the difference between a gene that is derepressed and one that is induced?
A. Genes that are derepressed are turned on because an inducer molecule is present. By comparison, a gene that is induced is turned on because a repressor protein is bound to the operator. B. There is no difference between a gene that is derepressed and one that is induced. C. A gene that is derepressed is turned on because a repressor protein is not bound without its cofactor. By comparison, a gene that is induced is turned on because an inducer molecule prevents binding of the repressor. D. A derepressed gene is turned off and an induced gene is activated to be expressed.
Which type of proteins is embedded in the cell membrane in both active transport and facilitated transport?
A. cytoskeletal B. structural C. targeted D. carrier
Sperm use ____ for their energy source
a. fructose b. glucose c. ions d. proteins e. prostate gland secretions